Exam Questions

Question 1

Describe how Global Positioning System (GPS) is used to locate the position of a car on the Earth’s surface (4)

Answer 1

1. (Several) satellites used
2. Distance from (each) satellite is determined
3. Position / distance is determined using c / speed
   of e.m waves / radio waves / microwaves and delay time (wtte)
4. Trilateration is used to locate the position of the car
   Or position of car is where circles / spheres cross (wtte)